A Negative Level is a monster strength indicator initially used only with Dark Synchro Monsters, but in recent times, they became one of two indicators (alongside positive Levels) used with Timewarp Monsters.
Negative Level Stars are color-inverted Level Stars, making them purple within blue circles, like this: As the inverse of positive Levels, Negative Levels start from the left side of the card and extend to the right. This behavior was later adopted by Rank Stars.
Like positive Levels, Negative Levels range from their own 1-12 range (-1 to -12), and all of them are possible on both Dark Synchro Monsters (due to the subtraction mechanic) and Timewarp Monsters (due to Level manipulation by Eon Counters).
Types of Monster Cards
Types of Spell Cards
Types of Trap Cards
Other Types of Card
ATK - DEF - Level - Rank - Attribute - Type
Playing Field Zones
Types of Summon
Types of Monster Effects
Types of Effect Monsters
Types of Spell Speed
Aqua - Beast - Beast-Warrior - Cyberse - Dinosaur - Dragon